Song of Innocence is the debut album of American composer and producer David Axelrod. It was released in October 1968 by Capitol Records. Axelrod sought to capitalize on the experimental climate of popular music at the time and composed the album as a suite-like tone poem based on Songs of Innocence, a 1789 illustrated collection of poems by William Blake. It was recorded at Capitol Studios in Los Angeles with an orchestra and a variety of studio musicians, including keyboardist and conductor Don Randi, guitarist Al Casey, bassist Carol Kaye, and drummer Earl Palmer.

Song of Innocence is an instrumental jazz fusion record that incorporates elements of classical, rock, funk, pop, and theatre music. It is arranged for bass, drums, and string instruments, written in the rock idiom with tempos centered on rock-based patterns by Palmer. Axelrod used contrast in his orchestral compositions and interspersed the album's euphoric psychedelic R&B form with dramatic, harrowing arrangements to reflect the supernatural themes found in Blake's poems. The music's reverent, psychedelic overtones evoke their themes of innocence and spirituality.

Although Song of Innocence was innovative for its application of rock and jazz techniques, it was not commercially successful and confounded contemporary critics, who viewed it as an ambitious curiosity piece. In the 1990s, critics reassessed the album as a classic, while leading disc jockeys in hip hop and electronica rediscovered and sampled the album's music. "Holy Thursday", the record's best-known song, was frequently sampled by hip hop producers. The renewed interest in Axelrod's work prompted Stateside Records to reissue Song of Innocence in 2000.

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